MR cerebral blood volume maps correlated with vascular endothelial growth factor expression and tumor grade in nonenhancing gliomas

MR cerebral blood volume maps correlated with vascular endothelial growth factor expression and tumor grade in nonenhancing gliomas

Author Maia Junior, Antonio Carlos Martins Autor UNIFESP Google Scholar
Malheiros, Suzana Maria Fleury Autor UNIFESP Google Scholar
Rocha, Antonio Jose da Autor UNIFESP Google Scholar
Silva, Carlos Jorge da Autor UNIFESP Google Scholar
Gabbai, Alberto Alain Autor UNIFESP Google Scholar
Ferraz, Fernando Antonio Patriani Autor UNIFESP Google Scholar
Stavale, Joao Norberto Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract BACKGROUND AND PURPOSE: Relative cerebral blood volume (rCBV) measurements derived from perfusion-weighted imaging (PWI) may be useful to evaluate angiogenesis and preoperatively estimate the grade of a glioma. We hypothesized that rCBV is correlated with vascular endothelial growth factor (VEGF) expression as marker of the angiogenic stimulus in presumed supratentorial low-grade gliomas (LGGs).METHODS: From February 2001 to February 2004, we examined 20 adults (16 men, four women; mean age 36 years; range, 23-60 years) with suspected (nonenhancing) supratentorial LGG on conventional MR imaging. Preoperative MR imaging used a dynamic first-pass gadolinium-enhanced, spin-echo echo-planar PWI. In heterogeneous tumors, we performed stereotactic biopsy in the high-perfusion areas before surgical resection. Semiquantitative grading of VEGF immunoreactivity was applied.RESULTS: Nine patients had diffuse astrocytomas (World Health Organization grade 11), and 11 had other LGG and anaplastic gliomas. In patients with heterogeneous tumors on PWI, the high-rCBV focus had areas of oligodendroglioma or anaplastic astrocytoma on stereotactic biopsy, whereas the surgical specimens were predominantly astrocytomas. Anaplastic gliomas had high rCBV ratios and positive VEGF immunoreactivity. Diffuse astrocytomas had negative VEGF expression and mean rCBV values significantly lower than those of the other two groups. Three diffuse astrocytomas had positive VEGF immunoreactivity and high rCBV values.CONCLUSION: Our results confirmed the correlation among rCBV measurements, VEGF expression, and histopathologic grade in nonenhancing gliomas. PWI may add useful data to the preoperative assessment of nonenhancing gliomas. Its contribution in predicting tumor behavior and patient prognosis remains to be determined.
Language English
Date 2005-04-01
Published in American Journal Of Neuroradiology. Oak Brook: Amer Soc Neuroradiology, v. 26, n. 4, p. 777-783, 2005.
ISSN 0195-6108 (Sherpa/Romeo, impact factor)
Publisher Amer Soc Neuroradiology
Extent 777-783
Origin http://www.ajnr.org/content/26/4/777.abstract
Access rights Closed access
Type Article
Web of Science ID WOS:000228273400019
URI http://repositorio.unifesp.br/11600/42320

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